Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be4c0e33b157a98…

MALICIOUS

PDF

44.8 KB Created: 2021-06-10 22:58:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 189d2dcd0ceffdd1bf4a97dcaa033f6e SHA-1: 20a7692a0ef79d979ff7f749ea7dfec3cb6f7ef4 SHA-256: 6be4c0e33b157a9800839d342b416d706b3e8b3636d00bedab3344aec748a4c1
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.tw/app/431946152/roblox-booga-booga-hacks-free-game-hack PDF link annotation
    • http://www.alpaca-buitensport.nl/images/coin-master-cheats-free_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/coin-master-apk-free-download_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/game-give-free-robux_GM431946152.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/freespinandcoin-blogspot-com_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/bleu-hack-roblox-download_GM431946152.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/roblox-games-free-to-play-online_GM431946152.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/coin-master-70-spin-link-2021_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/is-minecraft-free-on-switch_GM479516143.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/get-free-robux-no-inspect-fake_GM431946152.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/pubg-uc-earning-app-in-pakistan_GM1330123889.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FD9 26000 bytes
SHA-256: 0a6f547e8cbdea7c1d2b910b07d761fd8afd19d6445f7e8492ab838fcd33d042
font_01_sfnt_off00008b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B4D 18636 bytes
SHA-256: f9123f05071074a1a198ece20eb2f6f668ad88173e5e80312810afa6af795665

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